Find the missing numbers: 
Which of the following is correct? 
Look at this series:
U32, V29, ____, X23, Y20, ....
What number should fill the blank?
Out of the given answer figures, which is the correct one to replace the empty box? 
Select the option figure that will complete the series of question figures: 
Select the option that best suits the place of question mark (?) in the figure: 